Lack of originality (9)
I believe the answer is:
triteness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lack of originality</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for triteness that I've seen before include "dullness" , "Interests (anag.)" , "Interests in the commonplace" , "Interests of some staleness" , "Unoriginality" .)